I'm a DFAE in Japan. Our customer evaluates LTC3115-1 and faces similar to hiccup mode (Vo is up and down) when Vin=4V, Vo=12V and IO>200mA. The power supply design spec is Vin=4V~32V, Vo=12V and Io=300mA. It seems that the load current that can be made to flow stably decreases as the input voltage decreases. I don't find the word of "hiccup" on LTC3115-1 D/S. Could you please let me know how to improve?